# a right angle has 90 degrees

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**right angle**— right angles also right angle 1) N COUNT A right angle is an angle of ninety degrees. A square has four right angles. 2) PHRASE: oft PHR to n If two things are at right angles, they are situated so that they form an angle of 90° where they touch… …2

**Right ascension**— (abbrev. RA; symbol α) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.ExplanationRA is the celestial equivalent of… …3

**Angle**— This article is about angles in geometry. For other uses, see Angle (disambiguation). Oblique angle redirects here. For the cinematographic technique, see Dutch angle. ∠, the angle symbol In geometry, an angle is the figure formed by two rays… …4

**right-angled**— 1) ADJ: ADJ n A right angled triangle has one angle that is a right angle. [BRIT] (in AM, use right triangle) 2) ADJ: ADJ n A right angled bend is a sharp bend that turns through approximately ninety degrees …5

**Angle trisection**— The problem of trisecting the angle is a classic problem of compass and straightedge constructions of ancient Greek mathematics.Two tools are allowed # An un marked straightedge, and # a compass, Problem: construct an angle one third a given… …6

**Degrees of freedom (mechanics)**— In mechanics, degrees of freedom (DOF) are the set of independent displacements and/or rotations that specify completely the displaced or deformed position and orientation of the body or system. This is a fundamental concept relating to systems… …7

**Visual Angle Illusion**— The visual angle, V degrees, subtended by a viewed object sometimes looks larger or smaller than its actual value, creating a visual angle illusion (V illusion).These V illusions have been explicitly described by many vision researchers,… …8

**Degree (angle)**— One degree (shown in red) and ninety degrees (shown in blue) This article describes the unit of angle. For other meanings and some specific usages, see degree. A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by °… …9

**Dihedral angle**— In aerospace engineering, the dihedral is the angle between the two wings; see Dihedral (aircraft). In geometry, a dihedral or torsion angle is the angle between two planes. Figure 1: Dihedral angle of three vectors, defined as an exterior… …10

**Kurt Angle**— Angle at a WWE Q A in August 2005. Ring name(s) Kurt Angle Height 5 ft 10 in (1.78 m) …11

**Grad (angle)**— The grad is a unit of plane angle, equivalent to frac|1|400 of a full circle, dividing a right angle in 100. It is also known as gon, grade, or gradian (not to be confused with grade of a slope or gradient, or radian). One grad equals frac|9|10… …12

**Solid angle**— The solid angle, Ω , is the angle in three dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point. For instance, a small object nearby could subtend the same… …13

**Visual angle**— The visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc.It also is called the object s angular size. The sketch helps to define it 1,2It shows an observer s eye looking at a frontal extent (the vertical …14

**Hour angle**— In astronomy, the hour angle is one of the coordinates used in the equatorial coordinate system for describing the position of a point on the celestial sphere.The hour angle of a point is the angle between the half plane determined by the Earth… …15

**38 Degrees**— Founded May 2009 Location United Kingdom Key people David Babbs (executive director), Hannah Lownsbrough (campaigns director), Johnny Chatterton (digital campaigns manager) Focus progressive political activism Method petitions, lobbying MPs, ne …16

**Biological small-angle scattering**— Small angle scattering is a fundamental method for structure analysis of materials, including biological materials. Small angle scattering allows one to study the structure of a variety of objects such as solutions of biological macromolecules,… …17

**Dutch angle**— Dutch tilt, Dutch angle, Dutch shot, oblique angle, German angle, canted angle, Batman angle, or jaunty angle (in non cinematic static photography) are terms used for one of many cinematic techniques often used to portray the psychological… …18

**Small-angle approximation**— is a useful simplification of the laws of trigonometry which is only approximately true for finite angles, but correct in the limit as the angle approaches zero. It involves linearization of the trigonometric functions (truncation of their Taylor …19

**Action-angle coordinates**— In classical mechanics, action angle coordinates are a set of canonical coordinates useful in solving many integrable systems. The method of action angles is useful for obtaining the frequencies of oscillatory or rotational motion without solving …20

**degree**— [di grē′] n. [ME degre < OFr degré, degree, step, rank < VL * degradus < degradare: see DEGRADE] 1. any of the successive steps or stages in a process or series 2. a step in the direct line of descent [a cousin in the second degree] 3.… …